Description
Features
The MRCOOL MST07 Smart WiFi Thermostat is designed for convenient control of compatible 24V residential heating and cooling systems. It combines wall-mounted thermostat operation with WiFi connectivity, app control, smart scheduling, and voice assistant compatibility through the MRCOOL Connect platform.
- Works with most 24V heating and cooling systems, including furnaces, air conditioners, boilers, and heat pumps.
- Compatible with forced-air and radiant delivery systems where thermostat wiring requirements are met.
- Requires 24V AC power and a C-wire for thermostat power.
- Supports MRCOOL Connect app control for system management and scheduling.
- Includes smart schedule options, custom temperature thresholds, and an energy dashboard.
- Supports Alexa and Google Assistant integration through MRCOOL Connect.
- Can connect with up to ten optional remote zone sensors for room temperature and humidity monitoring.
- Wall-mounted design with compact 3.77 in. x 3.77 in. x 0.94 in. dimensions.
Benefits
The MST07 is built for homeowners who want smarter HVAC control without unnecessary complexity. It gives users the ability to manage comfort from the wall thermostat or from the app, making it easier to adjust settings when at home or away. For contractors and replacement installers, the MST07 provides a modern thermostat option for many common 24V system configurations.
- Helps modernize compatible residential HVAC systems with smart WiFi control.
- Allows schedule customization using home, away, and sleep presets.
- Supports better comfort management when paired with optional remote sensors.
- Provides app visibility into heating and cooling patterns through the energy dashboard.
- Offers a clean, compact wall-mounted appearance suitable for residential interiors.
Compatibility
The MST07 is intended for most compatible 24V heating and cooling systems. Manufacturer-supplied materials list compatibility with furnaces, air conditioners, boilers, and heat pumps using forced-air or radiant delivery. The installation manual also identifies wiring terminals for Rc, Rh, C, W1, W2, Y1, Y2, G, and O/B connections.
Important compatibility note: the thermostat requires a C-wire for power. The installation manual states that systems without a C-wire are incompatible. High-voltage thermostat systems may not be compatible and should be checked before installation.
Is The MRCOOL MST07 Right For Your System?
The MST07 is a strong fit when the existing HVAC equipment uses compatible 24V thermostat wiring and has a C-wire available for power. Before ordering, confirm the system type, existing thermostat terminals, and any local installation requirements.
| Heat Pumps | Suitable for many compatible 24V heat pump systems when the wiring and setup configuration match the thermostat requirements, including appropriate O/B and auxiliary or emergency heat wiring where applicable. |
|---|---|
| Furnaces | Appropriate for many compatible 24V furnace applications where the control wiring matches supported terminals such as W1, W2, G, Rh, Rc, and C. |
| Air Conditioners | Can support compatible central air conditioning systems using supported cooling terminals such as Y1 and Y2, when paired with proper 24V wiring and C-wire power. |
| Boilers | May be used with compatible 24V boiler or radiant applications when the system wiring and control requirements match the thermostat’s supported configuration. |
| Dual Fuel Systems | Review wiring and setup carefully before purchase. Dual fuel applications can require specific configuration, staging, and professional verification. |
| C-Wire Requirement | A C-wire is required. Systems without a C-wire are not compatible unless corrected by a qualified professional using an approved solution. |
Smart Home Integration
The MST07 connects through the MRCOOL Connect app, which supports app-based thermostat setup, comfort adjustment, smart schedules, and third-party voice assistant linking. Users may link the thermostat through Alexa or Google Assistant for voice-enabled control when the device is properly configured and connected.
Energy Savings
The MST07 includes scheduling tools, custom temperature thresholds, and an energy dashboard to help users review heating and cooling patterns. These features can support more disciplined comfort control and reduce unnecessary runtime when used correctly. Actual energy performance depends on system type, home conditions, user settings, climate, and installation quality.
Technical Specifications
| Brand | MRCOOL |
|---|---|
| Model | MST07 |
| Product Type | Smart WiFi Thermostat |
| Dimensions | 3.77 in. L x 3.77 in. W x 0.94 in. H |
| Metric Dimensions | 96 mm L x 96 mm W x 24 mm H |
| Power | 24V AC, 50/60 Hz |
| Mounting Type | Wall Mounted |
| Required Common Wire | C-wire required |
| Supported Terminals | Rc, Rh, C, W1, W2, Y1, Y2, G, O/B |
| Voice Assistant Support | Alexa and Google Assistant through MRCOOL Connect |
| Optional Remote Sensors | Up to 10 remote zone sensors; sold separately |
| Remote Sensor Functions | Temperature and humidity sensing |
| Remote Sensor Batteries | 2 AAA alkaline batteries |
| Remote Sensor Max Distance | 98.4 ft. / 30 m from thermostat |
| Warranty | 1-Year Limited Warranty |
Why Buy From HVACProSales
HVACProSales is an HVAC-focused ecommerce supplier serving homeowners, technicians, contractors, facility buyers, and maintenance teams with professional HVAC parts, controls, refrigeration products, tools, indoor air quality products, and MRO supplies. The MST07 listing is prepared with manufacturer-based details, compatibility reminders, and practical buying guidance so customers can order with better confidence.
- HVAC-focused catalog expertise rather than generic smart home merchandising.
- Clear model, UPC, GTIN, MAP, cost, and compatibility data for cleaner ordering and channel feeds.
- Manufacturer-documentation-based product content with no placeholder product claims.
- Helpful compatibility reminders for heat pumps, furnaces, air conditioners, boilers, dual fuel systems, and C-wire requirements.
- Internal product ecosystem support through thermostat, HVAC controls, and MRCOOL brand category navigation.
Recommended internal links: Thermostats Category, HVAC Controls Category, and MRCOOL Brand Page. Use the final live URLs from BigCommerce if category slugs differ.
